Indigoid vat dyestuff and process of making same



Patented duly 1, 1924.

ire STATES moans PATENT OFFICE.

KARL THIESS, OF LINDLINGEN, NEAR .HOCHST-ON-THE-MAIN, AND CARL JOSE!mitten, or EOCHST-ON-THE-MAIN,

GERMANY, assrenons', 'ro rannwnaxn vomu. mnrs'rnn- LUGIUS & alumina, orHOGHST-ON-Tm-MAIN, G RMANY, a

CORPORATION GE GERMANY.

INDIGOID VAT DTUFF AND PROCESS E5 MAKING SAME.

No Drawing.

To all whom it may concern:

Application filed April 17, 1924. Serial N0. 7073M.

q-chloride itself, a similar dyestufi is ob- Be it known that we, KARLTurtles and tain'ed.

CARnJosEF MfiLLnR, citizens of Germany, residing at Lindlingen, nearHOChSt-OIl-rthfl- 6 Main, and Hochst-on-the-Main, Germany,.

respectively, have invented certainnew and useful Improvements inIndigoid Vat Dyestuffs and Processes of Making Same, of which thefollowing is a specification.

10 We have'found that new indigoid vatdyestufl's are obtained bycondensing thecondensation, there must, in order to obtain the same goodresult,-be introduced halogen according to'the known methods. V Thefollowingexamples illustrate our invention: 7 y

(1) 240 parts by weight of 5.6-benzo-7-chlor0F3-ketodihydro-lz-thionaphthene a r e dissolved while hot in tentimes the quantity of chlorobenzene and after adding 295 parts b wei htof monobromo-t-naphthisatine-a-c lori e, heated to 100 (1., for one hourwhile stirring. The dyestufi thus obtained is filtered oif washed anddried. It forms a bluish-black crystalline powder which in alkalinehydrosul hite solution forms a reddish brown vat and dyes thetextilefibre bluish-black tints of great fastness.

132) If for the bromo -fi-naphthisatine-a oride be substituted the6-naphthisatine- (3) condensing the 5.6-benzo-7-chloro- 3-ketod1ydro-l-thionaphthene in the usual manner with the a-derivatives of thehalogenated 2.3-naphthisatines, vat dyestuffs dye- 1ng blue tints with agreen hue of great purity are obtained. v

Having now described our invention,

what we claim is:

1. The process of preparing indigoid vatdyestuffs which consists incondensing a. halogen substituted 5.6-'benzo-3-ketodihydr0- 1-t-hionaphthene with the reactive a-derivatives of the naphthisatineswhich condensat1t0I(11 product may be subsequently halogena e a r 2. Asnew products, the bodies of the general formula:

l wherein R stands for hydrogen and halogen, at least one It beinghalogen, and X stands for a naphthalene residue, which may besubstituted.

In testimony whereof, we aflix our signatures.

KARL THIESS. CARL JOSEF MULLER. Witnesses:

Jonnt'GUns'n, Ganamm'Fmscn.

